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Six Science posts #89
Dinos on FB, equinox at a temple, engineering a quiet night and more
Harshal Chhaya
September 28, 2025
Thanks to everyone who wrote in and agreed that “Back to the Future” is the BEST. MOVIE. EVAR! (this was in reference to last issue’s “fun facts about 88” that referenced 88mph as the magical speed for the DeLorean in that movie)
Y’all are alright! 😄
Those that don’t agree just haven’t seen it with the right friends. Let me know if you want to co-watch the movie so you can come around to seeing the facts.
Stay curious, friend!
Love,
Harshal
P.S. If you enjoy this newsletter, please forward it to a friend, a colleague, anyone who would appreciate being informed. Thanks!
#1 🤯
Equinox which happened at 22/09 at Padmanabha Swamy temple
— Anu Satheesh 🇮🇳🚩 (@AnuSatheesh5)
1:10 PM • Sep 25, 2025
The Sree Padmanabhaswamy Temple (Malayalam: [pɐd̪mɐnaːbʰɐswaːmi]) is a Hindu temple dedicated to Vishnu in Thiruvananthapuram, the capital of the state of Kerala, India.
The exact age and origin of the temple are unclear, but it is likely at least more than a thousand years old, if not quite a bit older.
On equinoxes (around March 20/21 and September 22/23), the setting sun aligns to pass sequentially through the windows of the Sree Padmanabhaswamy Temple's gopuram, a phenomenon highlighting the architectural brilliance and astronomical precision of the ancient temple in Kerala, India.
Hats off to the ancient engineers and architects for this feat that we still marvel at, centuries later.
Have you been to other similar ancient man-made wonders that are aligned to the cosmos?
#2 🤯
Ever wanted to block the noise of traffic at night but didn't want to close your window?
Have you considered building an active noise cancelling system with 24 speakers and a high quality microphone?
From nature.com/articles/s4159…
— foxes.bsky.social 🌈🦊 (@soft_fox_lad)
6:16 PM • Sep 27, 2025
I LOVE this kind of engineering project. Use high-tech to solve a mundane problem. I am all for it.
The paper titled “Active control of broadband sound through the open aperture of a full-sized domestic window” says:
We describe an active sound control system fitted onto the opening of the domestic window that attenuates the incident sound, achieving a global reduction in the room interior while maintaining natural ventilation.
Full paper is at https://www.nature.com/articles/s41598-020-66563-z
#3 🤯
You are not a big enough believer in technology's ability to reshape the world.
Here's the impact of one invention: the Haber-Bosch process.
— Christian Keil (@pronounced_kyle)
3:57 AM • Sep 28, 2025
The Haber-Bosch process, named after scientists Fritz Haber and Carl Bosch, is an industrial method for producing ammonia (NH₃) from atmospheric nitrogen (N₂) and hydrogen (H₂).
It revolutionized agriculture that led to better crop yields and prosperity.
More details: https://en.wikipedia.org/wiki/Haber_process
#4 🤯
Space fact:
The Milky Way galaxy is 105,700 light-years wide.
— World of Engineering (@engineers_feed)
12:19 AM • Sep 27, 2025
This reminded of the Douglas Adams line from Hitchhiker’s Guide to the Galaxy:
“Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.”
If you haven’t yet had the chance to read this book, please do so ASAP. Things will make so much more sense once you have read it. Trust me.
#5 🤯
Dinosaur Field Station of NJ is closing and their statues are on fb marketplace
— Fossil Locator (@FossilLocator)
4:35 PM • Sep 25, 2025
Wouldn’t it be cool to have these in your yard?
About to start a GoFundMe to get me some of these. Who’s in?
#6 🤯
Circular primes are numbers where every rotation of their digits also produces a prime number. For example, 193939 is a circular prime because all of its digit rotations are also prime:
193939 → 391939 → 939193 → 391939 → 939391 → 193939
All six of these rotations are
— Fermat's Library (@fermatslibrary)
5:57 PM • Sep 25, 2025
This is issue #89. Let’s see what makes 89 an interesting number:
89 is:
the atomic number of Actinium, a chemical element, symbol Ac
The actinide series, a set of 15 elements between actinium and lawrencium in the periodic table, are named for actinium.
the introduction of the actinides in 1945 was the most significant change to Dmitri Mendeleev's periodic table since the recognition of the lanthanides
Owing to its strong radioactivity, actinium glows in the dark with a pale blue light, which originates from the surrounding air ionized by the emitted energetic particles
The name actinium originates from the Ancient Greek aktis, aktinos , meaning beam or ray.
the 24th prime number, following 83 and preceding 97.
a Pythagorean prime - a prime number of the form 4 n + 1
Pythagorean primes are exactly the odd prime numbers that are the sum of two squares
In this case: 89 = 52 (25) + 82 (64)
The 11th Fibonacci number and thus a Fibonacci prime as well.
There are exactly 1000 prime numbers between 1 and 892 =7921.
(Harshal: This is such a cool and interesting and kind of pointless fact. I love it! 😀 )
There is no country with 89 as its international calling code
About
This newsletter is my way of sharing interesting science-related news with my curious friends. I enjoy finding science and math connections in our world.
Please share this newsletter with others. Let’s encourage curiosity.
That’s it for this issue.
Hit ‘reply’ to tell me what you think.
And hit ‘forward’ to share with your friends and family.
Let’s all celebrate science and engineering and curiosity.
Best wishes,
Harshal